From ccecf92b8c46d3db1da634fe5cf8a92b226d51f6 Mon Sep 17 00:00:00 2001
From: Tristan Riehs <tristan.riehs@bordeaux-inp.fr>
Date: Thu, 19 Oct 2023 22:09:32 +0200
Subject: stdin clone OK

---
 rpt.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/rpt.c b/rpt.c
index c515704..82e2c95 100644
--- a/rpt.c
+++ b/rpt.c
@@ -1,14 +1,21 @@
 #define _GNU_SOURCE		/* getopt_long */
 
 #include <errno.h>
+#include <fcntl.h>
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #define VERSION "1.0.0"
-#define TMPFILE "/tmp/repeat-tmp"
+
+/* Size of the buffer used to clone stdin. */
+#define BUFSIZE 8000
+
+/* File descriptor associated to the clone of stdin. */
+int clone_fd;
 
 void
 print_usage(FILE *output)
@@ -103,6 +110,39 @@ repeat_cmd(char **argv, long count, void (*handle_error_f)(int status))
 		invoke_cmd(argv, handle_error_f);
 }
 
+void
+copy_stdin()
+{
+	ssize_t nbytes;
+	char buf[BUFSIZE];
+	FILE *tmp_stream;
+
+	tmp_stream = tmpfile();
+
+	if (!tmp_stream)
+	{
+		perror("rpt");
+		exit(1);
+	}
+
+	clone_fd = fileno(tmp_stream);
+	errno = 0;
+
+	while ((nbytes = read(STDIN_FILENO, buf, BUFSIZE)) > 0)
+	{
+		if (write(clone_fd, buf, nbytes) < 0)
+			break;
+	}
+
+	fclose(tmp_stream);
+
+	if (errno)
+	{
+		perror("rpt");
+		exit(1);
+	}
+}
+
 int
 main(int argc, char* argv[])
 {
@@ -167,7 +207,9 @@ main(int argc, char* argv[])
 		return 3;
 	}
 
+	copy_stdin();
 	repeat_cmd(argv + optind, count, handle_error_f);
 
+	close(clone_fd);
 	return 0;
 }
-- 
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